The 0.65 millisecond pulse width functions as a high-precision thermal delivery mechanism designed to confine heat strictly to the hair follicle. By delivering high energy in a duration significantly shorter than the time it takes for the follicle to cool, this technology maximizes hair destruction while preventing thermal damage to the surrounding skin.
Core Takeaway The 0.65ms pulse width leverages the physics of "Thermal Relaxation Time" to deliver a rapid, potent spike of energy. This ensures the hair follicle reaches a destruction temperature instantly, before that heat has the opportunity to diffuse outward and injure the surrounding epidermis.
The Principle of Thermal Confinement
Leveraging Thermal Relaxation Time (TRT)
The 0.65 millisecond pulse is engineered to be significantly shorter than the Thermal Relaxation Time of a hair follicle, which typically ranges from 10 to 50 milliseconds. This timing ensures that the laser pulse ends well before the follicle has time to release a significant amount of its heat.
Localizing Energy Absorption
Because the pulse duration is so short, the energy remains localized within the target tissue. This creates a rapid temperature increase specifically within the hair shaft and bulb without affecting the adjacent dermal tissue.
Maximizing Destruction Efficiency
This technology releases high energy in an extremely short window. This allows the laser to effectively destroy the regenerative structures of the hair follicle by reaching the necessary thermal threshold almost instantly.
Safety and Skin Protection
Minimizing Heat Diffusion
The primary safety function of the 0.65ms pulse is the prevention of heat transfer. Since the energy delivery is faster than the rate of thermal conduction, heat does not have time to spread to the surrounding nerve-rich skin.
Protecting the Epidermis
The epidermis (the outer layer of skin) has a different thermal relaxation time than the hair follicle. The 0.65ms pulse width allows the thinner epidermis to remain cooler or dissipate incidental heat rapidly, protecting it from burns while the larger hair follicle retains the destructive heat.
Enhanced Tolerability
By preventing heat from "leaking" into surrounding tissues, the treatment minimizes the activation of pain receptors in the skin. This typically results in a higher level of patient comfort compared to technologies that allow heat to linger or spread.
Understanding the Trade-offs
High Peak Power vs. Gentle Heating
The 0.65ms pulse relies on high instantaneous peak power to be effective. In contrast, long-pulse modes (e.g., 50ms) use lower peak power over a longer duration to create a "gentle," gradual temperature increase, which distributes heat more uniformly but requires more time.
Balancing Efficacy and Risk
While the 0.65ms pulse is safer than nanosecond (Q-switched) pulses for hair removal, it is more aggressive than long-pulse options. The system must automatically optimize energy output to ensure this high power density destroys the hair without exceeding the skin's safety threshold.
Making the Right Choice for Your Goal
- If your primary focus is treatment safety and comfort: The 0.65ms pulse width is ideal because it prevents heat diffusion into the surrounding skin, minimizing side effects.
- If your primary focus is maximum thermal confinement: This technology is the superior choice, as it destroys the follicle before the energy can dissipate.
- If your primary focus is gradual, uniform heating: A longer pulse width (approaching 50ms) may be preferable for a sustained, gentler temperature increase.
The 0.65 millisecond technology represents a precise balance between speed and safety, ensuring the laser hits the target hard enough to destroy it, but fast enough to leave the surrounding skin untouched.
Summary Table:
| Feature | 0.65ms Short Pulse Technology | Traditional Long Pulse (30-50ms) |
|---|---|---|
| Energy Delivery | Rapid, high-peak power spike | Gradual, lower-power heating |
| Heat Confinement | Localized strictly to the follicle | Heat tends to diffuse to surrounding skin |
| TRT Alignment | Significantly shorter than follicle TRT | Often exceeds or matches follicle TRT |
| Patient Comfort | High (minimizes nerve activation) | Variable (residual heat can cause discomfort) |
| Primary Goal | Instant destruction & epidermis safety | Uniform, slow thermal accumulation |
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At BELIS, we specialize in professional-grade medical aesthetic equipment designed exclusively for clinics and premium salons. Our advanced laser systems, including Diode Hair Removal, Nd:YAG, and Pico lasers, utilize cutting-edge pulse technology like the 0.65ms duration to ensure your clients receive the most effective and comfortable treatments available.
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- Advanced Laser & RF: Diode Hair Removal, CO2 Fractional, HIFU, and Microneedle RF.
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References
- Khalil A. Khatri, Verónica García. Efficacy and safety of a 0.65 millisecond pulsed portable ND:YAG laser for hair removal. DOI: 10.1080/14764170802612976
This article is also based on technical information from Belislaser Knowledge Base .
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